Move webrtc/{tools => rtc_tools}

webrtc/tools/event_log_visualizer/chart.proto

-// Describes a chart generated from WebRTC event log data.
-syntax = "proto3";
-option optimize_for = LITE_RUNTIME;
-
-package webrtc.analytics;
-
-message ChartStyle {
-  enum Type {
-    UNDEFINED = 0;
-    LINE_CHART = 1;
-    BAR_CHART = 2;
-    LINE_STEP_CHART = 3;
-    SCATTER_CHART = 4;
-  }
-}
-
-message DataSet {
-  repeated float x_values = 1;
-  repeated float y_values = 2;
-  string label = 3;
-  ChartStyle.Type style = 4;
-  bool highlight_points = 5;
-}
-
-message Chart {
-  repeated DataSet data_sets = 1;
-  float xaxis_min = 2;
-  float xaxis_max = 3;
-  string xaxis_label = 4;
-  float yaxis_min = 5;
-  float yaxis_max = 6;
-  string yaxis_label = 7;
-  string title = 8;
-}
-
-message ChartCollection {
-  repeated Chart charts = 1;
-}